CNG can mean:

• Compressed natural gas, e.g., CNG vehicles
• Cypriot National Guard, the combined arms force of the Republic of Cyprus
• Chinese National Geography, magazine published in China
• Comfort Noise Generator used in Speech Codecs to insert artificial noise during silent intervals of speech.
• Conseil National de Gouvernement, provisional government of Haiti from 1986 to 1988
• Cyclic nucleotide-gated ion channel an ion channel gated by cyclic nuclotide like cAMP
• Certified Naturally Grown a certification program for small-scale, direct-market organic farmers
• Cryptography API: Next Generation, the pluggable Windows Cryptography API introduced in Windows Vista

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